I would not be suprised if it becomes means tested.
The DLA to PIP was in place to get people off the benefit, mostly by moving the goal post on the “distance walked” question. This worked and MANY disabled people with mobility problems were denied the higher rate. But suddenly MANY other claimants with mental health issues became eligibe for the mobility component. I don’t know the exact figures, but I think overall, including setting up PIP and all the extra reassessments (especially those with “lifetime” awards) instead of a saving, it’s actually costing the government more now with PIP than DLA.
I’m sure that disabled benefits will be high up on the list of ways to make a saving.